The Battle of Ankara or Angora was fought on 20 July 1402 at the Tchubuk plain near Angora between the forces of the Ottoman Sultan Bayezid I (Bajazet) and Timur (Tamerlane), ruler of the Timurid Empire. The battle was a major victory for Timur, and it led to a period of crisis for the Ottoman Empire (the Ottoman Interregnum). However, the Timurid Empire went into terminal decline following Timur's death just three years after the battle, while the Ottoman Empire made a full recovery, and continued to increase in power for another two to three centuries.

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Timur, a Turco-Mongol from Transoxiana (now Uzbekistan), had built an empire in Central Asia over the years, and became the most powerful ruler in Central Asia since Genghis Khan (from whom he also claimed descent).[1] He sought to rebuild the once great Mongol Empire.[2] In the 1380s and 1390s, he invaded and conquered parts of Persia (including Armenia, Azerbaijan and Upper Mesopotamia), ravaged southern Russia and Ukraine (1395–96), and invaded India (1398).[3] Although there had been tensions between the Ottomans and Mongols, nothing would warrant a war, until Bayezid demanded tribute from an emir loyal to Timur, which he understood to be personal and a reason for war.[4] In 1400–01 Timur took Sivas from the Ottomans, parts of Syria from the Mamluks, and next directed towards Anatolia.[4]

Meanwhile, in 1402, the Ottomans had been campaigning in Europe. Bayezid broke off the blockade of Constantinople and marched to Ankara after Timur again moved his army to the southeast in the summer of 1402.[4]

It is estimated that the Timurid army counted 140,000,[5] mostly cavalry, and also 32 war elephants.[4] Bayezid's army numbered 85,000.[5][4] Historical sources exaggerated the number of troops to unrealistic proportions: Ahmad ibn Arabshah claimed 800,000 Timurid troops, while a German witness claimed 1.6 million, for instance.[6]

Bayezid reluctantly withdrew his forces from the blockade of Constantinople and marched them through the midsummer heat. When they arrived, they were tired and thirsty, but were allowed no time to rest or recuperate. Bayezid was advised by his generals to take up defensive positions and, when Timur's forces pushed back the Ottomans, to withdraw into the mountains and force Timur to break ranks and attempt to hunt the Ottomans in their own terrain during the midsummer heat. Bayezid instead chose to take an offensive stance and marched eastward. Advancing Ottoman scouts found no traces of the Timurids, who secretly marched southwest, rested, and were situated to the rear of the Ottomans. The Timurids encamped in the same locations that the Ottomans had previously occupied, making use of abandoned tents and water sources.[10]

In the Timurid army, Timur commanded the centre, his sons Miran and Rukh the right and left, respectively, and his grandsons the vanguard.[4]

In the Ottoman army, Bayezid commanded the centre with Janissaries, his son Suleyman the left flank with the best troops, Stefan Lazarević the right with the Balkan troops, and his son Mehmed the rear guard.[4]

The battle began with a large-scale attack from the Ottomans, countered by swarms of arrows from the Timurid horse archers. Several thousands were killed and many surrendered to Timur. Stefan Lazarević and his knights together with Wallachian[contradictory] forces successfully fought off the Timurid assaults and cut through the Mongol ranks three times. Each time Stefan advised Bayezid to break out with him, Bayezid declined to do so. But the Serbians managed to save one of Bayezid's sons and the treasury from the Mongols and made their way to Constantinople. The Serbian troops wore heavy black plate armour which was very effective against the Timurid arrows. Timur admired the Serbian troops who according to him "fight like lions". During the battle the main water supply of both armies, Çubuk creek, was diverted to an off-stream reservoir near the town of Çubuk by Timur, which left the Ottoman army with no water. The final battle took place at Catal hill, dominating the Çubuk valley. The Ottoman army, both thirsty and tired, was defeated, though Bayezid managed to escape to the nearby mountains with a few hundred horsemen. However, Timur had the mountains surrounded and, heavily outnumbering Bayezid, soon captured him. He died in captivity three months later. Already heavily outnumbered, the Ottoman army was further weakened by the desertion of the Black Tatars and the Sipahis from the Anatolian beyliks, who left Bayezid's side and joined Timur's forces.[11]

The battle was catastrophic for the Ottoman state, fracturing what remained and bringing almost total collapse of the empire. This resulted in a civil war among Bayezid's sons. The Ottoman civil war continued for another 11 years (1413) following the Battle of Ankara.

The battle is also significant in Ottoman history as being the only time a Sultan was captured in person.